M, O, Q, S, ?

B. T

Complete the series: m, n, p, q, ?

A. R

What is the next letter in the series: A, C, E, G, I, ?

B. J

What is the missing number in the series: 2, 4, 8, 16, ?, 64?

A. 32

Find the missing number in the series: 5, 10, 20, 40, ?

C. 80